Vane type pumps



M. POTTS VANE TYPE PUMPS July 29, 1969 2 Sheets-Sheet 1 Filed July 27, 1967 FIG.2

July-29, 1969 M. POTTS VANE TYPE PUMPS Filed' July 27, 1967 2 Sheets-Sheet 2 United States Patent US. Cl. 103144 1 Claim ABSTRACT OF THE DISCLOSURE In a vane type pump having a hollow body containing a rotatable off-set member, the vanes are mounted upon a spindle by mounting one of the vanes directly thereon and mounting the other or others upon said one vane, permitting angular movement between the vanes.

This invention relates to vane type pumps of the kind comprising a body defining an interior cylindrical cavity having an inlet and an outlet, a hollow member mounted within the body for rotation about an axis olfset from the axis of the cavity, a spindle mounted concentrically within the cavity and disposed within the hollow member, said spindle having journalled thereon at least two relatively movable vanes arranged to extend through respective spaced openings in the wall of the hollow member, rotation of the hollow member within the body causing the vanes successively to sweep the space defined between the hollow member and the cavity wall, the vanes being rotated about the spindle and being moved angularly with respect to one another as they rotate. Such a pump will be referred to for convenience as being of the kind specified.

It has previously been proposed to provide vane pumps of the kind specified in which each of the plurality of vanes is mounted independently on the spindle through its own roller bearing. This is a relatively expensive construction.

An object of the present invention is to provide a less expensive means of mounting the vanes on the spindle than has been the case in previously proposed arrangements.

According to the present invention there is provided a vane type pump of the kind specified in which one of the vanes is mounted for rotation about the spindle and the other vane or vanes are mounted on said one vane so as to permit relative angular movement between the vanes.

Embodiments of the invention will now be described, by way of example, with reference to the accompany drawing in which:

FIGURE 1 is a cross-sectional view of a first embodiment of pump embodying the invention,

FIGURE 2 is a cross-sectional view of a pair of vanes and their mounting for use in the pump illustrated in FIG. 1 and,

FIGURE 3 is a cross-sectional view of a second embodiment of pump embodying the invention.

Referring to FIGS. 1 and 2 of the drawings, a vane pump comprises a body defining an interior cylindrical cavity 11 within which is mounted a hollow cylindrical member 12. The exterior wall of the member 12 engages in sealing fashion the wall of the cavity 11 at a position between an inlet 13 and an outlet 14 to the cavity 11, both the inlet 13 and outlet 14 being formed in the body Mounted in the body 10 and concentrically with the ice cavity 11 is a spindle 15 upon which is carried a pair of vanes 16, 17 which extend through slots 18 in the wall of the member 12 and the seals 19 engage each side face to each vane.

The vanes 16, 17 are mounted on the spindle 15 in the following manner. A sleeve 20 is mounted through the intermediary of a pair of spaced roller bearings 21 on the spindle 15 and the sleeve 20 has fixedly secured thereto a clamp which has portions 22a, which encircle the sleeve 20 at each of its ends and a pair of integral crosspieces 22b extend therebetween. The vane 16 is secured between the crosspieces 22b by means of rivets 23. The vane 17 is secured by rivets 24 to a clamp 25 mounted through a plain bearing 26 on the sleeve 20 between the portions 22a.

By means of the above-described mounting of the vanes 16 and 17, the roller bearings 21 are suitable to permit relative rotation-between the spindle 15 and sleeve 20 and the plain bearing 26 is all that is necessary for the small amount of relative angular movement which takes place between the vanes 16 and 17 during operation of the pump. Furthermore the centrifugal loads on the bearings are applied largely to the bearing 26, thus relieving the rotating bearings 21.

It is to be understood that the pump can carry a larger number of vanes than described above and in such a case one vane is mounted directly upon the spindle 15, whilst all of the others are mounted on that one vane through appropriate plain bearings or equivalent relatively inexpensive bearings which are suitable for the small amount of relative angular movement between the vanes during operation of the pump.

In the pump shown in FIG. 3, the pump and method of mounting the vanes is identical to that described in the pump shown in FIGS. 1 and 2, with the exception that in FIG. 3 the pump is provided with a labyrinth seal on the wall of the cavity 11. The seal consists of a series of grooves 27 running parallel to the spindle 15.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A vane type pum comprising a body defining an interior cylindrical cavity, said body having an inlet and an outlet, a hollow member rotatably mounted within the body cavity about an axis off-set from that of the cavity, a spindle mounted concentrically within the body cavity and within the hollow member, at least two relatively movable vanes journalled on the spindle, said vanes extending through respective spaced openings in the wall of the hollow member, one of the vanes being directly mounted for rotation on the spindle through a roller bearing, and the other vane being mounted upon said one vane through a plain bearing, to permit relative angular movement between the vanes.

References Cited UNITED STATES PATENTS 891,372 6/1908 Reichhelm 230-157 1,616,285 2/1927 Stern 103--144 1,994,245 3/1935 Gette 230-157 3,086,476 4/ 1963 Weiss 103-144 DONLEY I. STOCKING, Primary Examiner WARREN J. KRAUSS, Assistant Examiner US. Cl. X.R. 12316; 23057 

